Hierarchically porous carbon nanosheets were synthesized by using homogeneous mixture of soluble phenolic resin and KOH activator, which was carbonized and activated through one step. Structural characterization revealed that the as-prepared carbon materials consisted of abundant macropores, mesopores and micropores from the carbonization of the resin and activation of KOH. With the appropriate ratio of KOH to resol resin, hierarchically porous carbon nanosheets with specific surface area beyond 3000 m²g⁻¹ and average pore size of up to 3.44 nm were achieved, which exhibited a high specific capacitance of 365.6 F g⁻¹ at 0.5 A g⁻¹, excellent cycle life with 98.7% specific capacitance retained after 10,000 cycles, and high energy density of 12.7 Wh Kg⁻¹ when measured as an electrode in a coin type symmetric supercapacitor in 6 M KOH electrolyte, indicating a promising electrode material for real energy storage in supercapacitors.

通过使用可溶性酚醛树脂和KOH活化剂的均匀混合物合成分层多孔的碳纳米片，将其碳化并通过一个步骤将其活化。结构表征表明，所制备的碳材料由树脂碳化和KOH活化而形成的大量大孔，中孔和微孔组成。用KOH的以酚醛树脂，分级多孔碳纳米片与比表面积超过3000米处，适当比例²克^-1和至多3.44纳米的平均孔尺寸被实现，这就表现出365.6 F G高的比电容^-1在0.5 A g ^-1，在10,000次循环后仍具有98.7％的比电容，优异的循环寿命以及在6 M KOH电解质中的硬币型对称超级电容器中作为电极测量时的高能量密度为12.7 Wh Kg ^-1，表明该电极材料有望用于实际储能在超级电容器中。